(7x²-4xy+2y²)-2(x²-二分之三y²)
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(7x²-4xy+2y²)-2(x²-二分之三y²)
(7x²-4xy+2y²)-2(x²-二分之三y²)
(7x²-4xy+2y²)-2(x²-二分之三y²)
(7x²-4xy+2y²)-2(x²-二分之三y²)
=7x²-4xy+2y²-2x²+3y²
=5x²-4xy+5y²